import copy
"""
men={
		'A': ['W', 'X', 'Z', 'Y'],
		'B': ['W', 'Y', 'Z', 'X'], 
		'C': ['X', 'W', 'Y', 'Z'],
		'D': ['W', 'Z', 'X', 'Y']}  
women={
		'W':['D', 'B', 'C', 'A'],
		'X': ['D', 'B', 'A', 'C'],
		'Y': ['A', 'D', 'B', 'C'],
		'Z': ['B', 'A', 'D', 'C'],
		'U': ['B', 'A', 'D', 'C']}	  

guyprefers = {
 'abe':  ['abi', 'eve', 'cath', 'ivy', 'jan', 'dee', 'fay', 'bea', 'hope', 'gay'],
 'bob':  ['cath', 'hope', 'abi', 'dee', 'eve', 'fay', 'bea', 'jan', 'ivy', 'gay'],
 'col':  ['hope', 'eve', 'abi', 'dee', 'bea', 'fay', 'ivy', 'gay', 'cath', 'jan'],
 'dan':  ['ivy', 'fay', 'dee', 'gay', 'hope', 'eve', 'jan', 'bea', 'cath', 'abi'],
 'ed':   ['jan', 'dee', 'bea', 'cath', 'fay', 'eve', 'abi', 'ivy', 'hope', 'gay'],
 'fred': ['bea', 'abi', 'dee', 'gay', 'eve', 'ivy', 'cath', 'jan', 'hope', 'fay'],
 'gav':  ['gay', 'eve', 'ivy', 'bea', 'cath', 'abi', 'dee', 'hope', 'jan', 'fay'],
 'hal':  ['abi', 'eve', 'hope', 'fay', 'ivy', 'cath', 'jan', 'bea', 'gay', 'dee'],
 'ian':  ['hope', 'cath', 'dee', 'gay', 'bea', 'abi', 'fay', 'ivy', 'jan', 'eve'],
 'jon':  ['abi', 'fay', 'jan', 'gay', 'eve', 'bea', 'dee', 'cath', 'ivy', 'hope']}
galprefers = {
 'abi':  ['bob', 'fred', 'jon', 'gav', 'ian', 'abe', 'dan', 'ed', 'col', 'hal'],
 'bea':  ['bob', 'abe', 'col', 'fred', 'gav', 'dan', 'ian', 'ed', 'jon', 'hal'],
 'cath': ['fred', 'bob', 'ed', 'gav', 'hal', 'col', 'ian', 'abe', 'dan', 'jon'],
 'dee':  ['fred', 'jon', 'col', 'abe', 'ian', 'hal', 'gav', 'dan', 'bob', 'ed'],
 'eve':  ['jon', 'hal', 'fred', 'dan', 'abe', 'gav', 'col', 'ed', 'ian', 'bob'],
 'fay':  ['bob', 'abe', 'ed', 'ian', 'jon', 'dan', 'fred', 'gav', 'col', 'hal'],
 'gay':  ['jon', 'gav', 'hal', 'fred', 'bob', 'abe', 'col', 'ed', 'dan', 'ian'],
 'hope': ['gav', 'jon', 'bob', 'abe', 'ian', 'dan', 'hal', 'ed', 'col', 'fred'],
 'ivy':  ['ian', 'col', 'hal', 'gav', 'fred', 'bob', 'abe', 'ed', 'jon', 'dan'],
 'jan':  ['ed', 'hal', 'gav', 'abe', 'bob', 'jon', 'col', 'ian', 'fred', 'dan']}

guyprefers=men
galprefers=women
guys = sorted(guyprefers.keys())
gals = sorted(galprefers.keys())
"""

 
def check(engaged):
    inverseengaged = dict((v,k) for k,v in engaged.items())
    for she, he in engaged.items():
        shelikes = galprefers[she]
        shelikesbetter = shelikes[:shelikes.index(he)]
        helikes = guyprefers[he]
        helikesbetter = helikes[:helikes.index(she)]
        for guy in shelikesbetter:
            guysgirl = inverseengaged[guy]
            guylikes = guyprefers[guy]
            if guylikes.index(guysgirl) > guylikes.index(she):
                print("%s and %s like each other better than "
                      "their present partners: %s and %s, respectively"
                      % (she, guy, he, guysgirl))
                return False
        for gal in helikesbetter:
            girlsguy = engaged[gal]
            gallikes = galprefers[gal]
            if gallikes.index(girlsguy) > gallikes.index(he):
                print("%s and %s like each other better than "
                      "their present partners: %s and %s, respectively"
                      % (he, gal, she, girlsguy))
                return False
    return True
 
def matchmaker(menprefers,womenprefers):
    guys = sorted(menprefers.keys())
    gals = sorted(womenprefers.keys())
    guysfree = guys[:]
    engaged  = {}
    guyprefers2 = copy.deepcopy(menprefers)
    galprefers2 = copy.deepcopy(womenprefers)
    while guysfree:
        guy = guysfree.pop(0)
        guyslist = guyprefers2[guy]
        gal = guyslist.pop(0)
        fiance = engaged.get(gal)
        if not fiance:
            # She's free
            engaged[gal] = guy
            #print("  %s and %s" % (guy, gal))
        else:
            # The bounder proposes to an engaged lass!
            galslist = galprefers2[gal]
            if galslist.index(fiance) > galslist.index(guy):
                # She prefers new guy
                engaged[gal] = guy
                #print("  %s dumped %s for %s" % (gal, fiance, guy))
                if guyprefers2[fiance]:
                    # Ex has more girls to try
                    guysfree.append(fiance)
            else:
                # She is faithful to old fiance
                if guyslist:
                    # Look again
                    guysfree.append(guy)
    return engaged
 
def test(): 
	matchmaker()
	print('\nEngagements:')
	engaged = matchmaker()
 
	print('\nCouples:')
	print('  ' + ',\n  '.join('%s is engaged to %s' % couple
                          for couple in sorted(engaged.items())))
	print()
	print('Engagement stability check PASSED'
      if check(engaged) else 'Engagement stability check FAILED')
 
	print('\n\nSwapping two fiances to introduce an error')
	engaged[gals[0]], engaged[gals[1]] = engaged[gals[1]], engaged[gals[0]]
	for gal in gals[:2]:
		print('  %s is now engaged to %s' % (gal, engaged[gal]))
	print()
	print('Engagement stability check PASSED'
		if check(engaged) else 'Engagement stability check FAILED')
if __name__=="__main__":
	test()